Algorithm problem

In-order traversal of the tree

Prerequisite knowledge points:
Understanding Data Structure: Tree
Learn what is in-order traversal of a tree

Detailed algorithm

Algorithm problem

Achieve tree traversal

Prerequisite knowledge points:
Understanding Data Structure: Tree
Learn what a tree traversal is

Detailed algorithm

Algorithm problem

Implement a functional algorithm to calculate the nth number in the Fibonacci sequence?

The Fibonacci sequence is this sequence:
1 1 2 3 5 8 13 21 34 55 89 …
The first and second are both 1
The nth number is the sum of the n-1th number and the n-2th number

The problem is, given n, what is the nth number

Detailed algorithm

Algorithm problem

Implement an algorithm to determine if the given parenthesis string is a valid parenthesis pair?

For example, the following are valid parentheses:
‘()’
‘()’
‘[]’
‘(){}[]’
‘(()[])()’
‘’

The following are invalid parenthesis pairs:
‘)(‘
‘}{‘
‘(())’
‘({})][‘

Mainly the paired left and right parentheses can appear in the correct order, then it is a valid pair
We assume that the empty string is also a valid pair of parentheses

Detailed algorithm

Question

How to configure browser cache in nginx expires max-age etc.

Detailed

Open nginx configuration file

Question

How to configure gzip deflte compression in nginx?

Detailed

Open nginx configuration file

Algorithm problem

What are deep and shallow copies? How to implement deep copy and shallow copy algorithms?

Algorithm answer

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The Collapse of the American Empire (Norway) by John Galton.pdf

According to data from the Chinese Society for Extracorporeal Life Support, as of December 31, 2018, there were only 260 hospitals in China that could do ECMO, and only 400 of the country ’s ECMOs

During the epidemic, 16 ECMOs were airlifted from Frankfurt to Wuhan

According to network sources:
Guangdong Provincial People’s Hospital has at least 6 ecmo machines

According to the State Drug Administration, there are currently no registration information for ecmo-related companies in the country, that is, 0 domestic companies that can produce ecmo, but there are some companies that produce or represent ecmo parts. Below we have Take a look:

At present, most of the domestic ecmo come from these three international companies, which are Medtronics, Germany Sorin, and German Maico, and these companies occupy the top three ecmo markets Name, and more than 70% of the market

But we can find ecmo parts companies from the State Drug Administration: